1666414236623 has 2 divisors, whose sum is σ = 1666414236624. Its totient is φ = 1666414236622.

The previous prime is 1666414236587. The next prime is 1666414236673. The reversal of 1666414236623 is 3266324146661.

It is an a-pointer prime, because the next prime (1666414236673) can be obtained adding 1666414236623 to its sum of digits (50).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1666414236623 - 2¹⁰ = 1666414235599 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1666414236673) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 833207118311 + 833207118312.

It is an arithmetic number, because the mean of its divisors is an integer number (833207118312).

Almost surely, 2^{1666414236623} is an apocalyptic number.

1666414236623 is a deficient number, since it is larger than the sum of its proper divisors (1).

1666414236623 is an equidigital number, since it uses as much as digits as its factorization.

1666414236623 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4478976, while the sum is 50.

The spelling of 1666414236623 in words is "one trillion, six hundred sixty-six billion, four hundred fourteen million, two hundred thirty-six thousand, six hundred twenty-three".